APPC Security Information Sent Even If Host Doesn't Support It

ID: Q185503

The information in this article applies to:
  • Microsoft SNA Server, versions 3.0 SP2, 3.0 SP3, and 4.0

SYMPTOMS

An APPC/CPI-C application that has been used to successfully connect to a host system (mainframe computer or AS/400) with previous versions of Microsoft SNA Server may fail when the host system returns an UNBIND message with SNA Server versions 3.0, SP2, 3.0 SP3, and 4.0.

This problem has been reported by customers using the following programs, but may occur with other APPC/CPI-C applications.

  • Microsoft COM Transaction Integrator for CICS and IMS version 1.0 included with SNA Server version 4.0


  • IBM CICS for Windows NT


SNA Server Data Link Control (DLC) message tracing shows that the UNBIND message received from the host system indicates a session failure (UNBIND Type 0x'FE') that includes IBM Sense Data 0x'10086040'.

In addition, the following messages may be logged in the Windows NT Application Event Log on the computer where SNA Server is running: 


   Event ID: 90
   Source: SNA APPC Application
   Description: APPC protocol violation:

      Sense data   = 0C001110
      TP_ID        = 0000000080197900
      Conv_ID      = 00792100

   EXPLANATION: A protocol violation was detected on an APPC conversation.
   The TP_ID and Conv_ID in this message were shown on a previous message.
   The conversation failure is reported to the local TP with a return code
   of AP_CONV_FAILURE_NO_RETRY. The SNA sense data provides detail about
   the error type.

   Event ID: 38
   Source: SNA Server
   Description: APPC session deactivated abnormally

      Qualifier      = 0003
      Connection     = <Connection Name>
      LU alias       = <Local LU Alias>
      PLU alias      = <Partner LU Alias>
      Mode name      = <APPC Mode Name>

   <..data omitted...>

   EXPLANATION: An APPC session has been deactivated abnormally. The
   qualifier listed above corresponds to one of the following:

   <..data omitted...>

   0003 The session was deactivated because of a permanent (No retry)
   error, such as a parameter mismatch. Contact the administrator of
   the partner LU's system to determine which parameters are mismatched.


Because Events 90 and 38 may be caused by other problems, these events alone are not sufficient to indicate whether the specific problem described here is being encountered.

For additional information about Event 38 messages and their common causes, please see the following article in the Microsoft Knowledge Base:

Q139113 SNA Server Event 38, Qualifier 0004 and 0005 Not Documented


CAUSE

The SNA Server APPC library is adding the Access Security Information (User ID and Password) fields to the FMH-5 Attach message that is being sent to the host even though the host system indicated that it does not support the inclusion of these fields in the BIND +RSP that is sent to SNA Server.

Bit 3 of byte 23 of the BIND is used to indicate whether the Access Security Information fields will be accepted on incoming FMH-5 Attaches. Please refer to the "IBM SNA Formats Guide" (GA27-3136), Chapter 6 for more details on the structure of the BIND.


RESOLUTION

SNA Server 3.0

To resolve this problem, obtain the latest service pack for SNA Server version 3.0. For additional information, please see the following article in the Microsoft Knowledge Base:
Q184307 How to Obtain the Latest SNA Server Version 3.0 Service Pack

SNA Server 4.0

This problem has been corrected in the latest U.S. Service Pack for SNA Server version 4.0. For information on obtaining the Service Pack, query on the following word in the Microsoft Knowledge Base (without the spaces): 


   S E R V P A C K


STATUS

Microsoft has confirmed this to be a problem in SNA Server, versions 3.0 SP2, 3.0 SP3, and 4.0. This problem was first corrected in SNA Server 3.0 Service Pack 4.


MORE INFORMATION

SNA Server DLC message traces that capture the problem will appear similar to the annotated traces shown here: 


   DLC   01020101-&gt;04160000 DLC DATA
   DLC                      DAF:04 OAF:02 ODAI:on  Exp.
   DLC                      BIND   RQD SC  FI BC EC DR1
   DLC
   DLC   ---- Header  at address 01214480, 1 elements ----
   DLC   00000000 00002F00 04020000 01001401
&lt;....../.........&gt;
   DLC
   DLC   ---- Element at address 0170BED4, start 10, end 126 ----
   DLC   6B800031 001307B0 B050B107 07898987
&lt;k..1.....P...iig&gt;
   DLC   07060200 00000000 00001623 000010E4
&lt;...........#...U&gt;
   DLC   E2D4E4E3 D3F0F14B D4E2E2D3 E4F1F632
&lt;SMUTL01KMSSLU162&gt;
   DLC   000902C4 E2C9D3F6 D4D6C409 03F00000
&lt;...DSIL6MOD..0..&gt;
   DLC   00000000 051104E4 E2D4E4E3 D3F0F14B
&lt;.......USMUTL01K&gt;
   DLC   D4E2E2D3 E4F1F60A 13001714 5F7F7341
&lt;MSSLU16....._[ASCII
         166]sA&gt;
   DLC   E14B0011 E4E2D4E4 E3D3F0F1 4BC3C9C3
&lt;.K..USMUTL01KCIC&gt;
   DLC   E2C3E5F3 F1                             &lt;SCV31
&gt;


BIND sent to the host system when the APPC application is started.

Byte 23 (where '0x31' is Byte 00) is the Security Support Indicators and is set to '0x16' in this example. SNA Server indicates that Access Security Information will be accepted on incoming FMH-5 Attach messages (Bit 3 of byte 23 = 1). 


   DLC   -----------------------------------------------
13:56:20.0
   DLC   04160000-&gt;01020101 DLC DATA
   DLC                      DAF:02 OAF:04 ODAI:on  Exp.
   DLC                      BIND   +RSP SC  FI BC EC DR1
   DLC
   DLC   ---- Header  at address 012144B4, 1 elements ----
   DLC   04010004 10112F00 02040000 01002E01
&lt;....../.........&gt;
   DLC
   DLC   ---- Element at address 0170BA44, start 10, end 83 ----
   DLC   EB800031 001307B0 B050B107 03898983
&lt;...1.....P...iic&gt;
   DLC   07060200 00000000 00000023 00000028
&lt;...........#...(&gt;
   DLC   000902C4 E2C9D3F6 D4D6C409 03F00000
&lt;...DSIL6MOD..0..&gt;
   DLC   00000000 051205E4 E2D4E4E3 D3F0F14B
&lt;.......USMUTL01K&gt;
   DLC   C3C9C3E2 C3E5F3F1 0000                  &lt;CICSCV31..
&gt;


The host system sends a BIND +RSP back to SNA Server and sets Byte 23 to '0x00'. The host system indicates that it will not accept Access Security Information fields on incoming FMH-5 Attach messages by setting Bit 3 of Byte 23 to 0.

SNA Server accepts this BIND +RSP, so the APPC library should not be putting the Access Security Information in the Attach, even if the APPC/CPI- C application indicates that these fields should be set. An APPC/CPI-C application can specify that conversation security requiring a User ID and Password is required by setting the security parameter in the MC_ALLOCATE verb to AP_PGM. 


   DLC   -----------------------------------------------
13:56:50.0359
   DLC   01020101-&gt;04160000 DLC DATA
   DLC                      DAF:04 OAF:02 ODAI:on  Normal
   DLC                      RQE FMD FI BC EC DR1 BB CD
   DLC
   DLC   ---- Header  at address 012144B4, 1 elements ----
   DLC   0B050000 17002E00 04020002 01004A01
&lt;..............J.&gt;
   DLC
   DLC   ---- Element at address 0170C240, start 10, end 103 ----
   DLC   0B90A02E 0502FF00 03D10040 04C3C3C9
&lt;.........J.@.CCI&gt;
   DLC   D5040102 01011910 E4E2D4E4 E3D3F0F1
&lt;N.......USMUTL01&gt;
   DLC   4BD4E2E2 D3E4F1F6 07CE0306 0D380001
&lt;KMSSLU16.....8..&gt;
   DLC   00002D12 FF000000 0C010100 00000000     &lt;..-
.............&gt;
   DLC   03000000 0D01D4E2 E2D3E4F1 F6400000
&lt;......MSSLU16@..&gt;
   DLC   000803F4 F3F70000 00080401 0000
&lt;...437........  &gt;


The FMH-5 Attach message shown here includes the Access Security Information fields for User ID and Password although they are blank in this example. For additional information about how to interpret an FMH- 5 Attach message, please see the following article in the Microsoft Knowledge Base:
ARTICLE-ID: Q169575 TITLE : Interpreting an FMH-5 Attach for Independent LU 6.2


Continuation of the trace: 


   DLC   -----------------------------------------------
13:56:50.0437
   DLC   04160000-&gt;01020101 DLC DATA
   DLC                      DAF:02 OAF:04 ODAI:on  Exp.
   DLC                      UNBIND RQD SC  FI BC EC DR1
   DLC
   DLC   ---- Header  at address 012145B8, 1 elements ----
   DLC   0B050000 17002F00 02042224 01002E01
&lt;....../..."$....&gt;

   DLC
   DLC   ---- Element at address 0170BED4, start 10, end 18 ----
   DLC   6B800032 FE100860 40                    &lt;k..2...`@
&gt;


The host system responds to this FMH-5 Attach message with an UNBIND Type '0xFE' (session failure) message shown here. The UNBIND message can be broken out as follows: 


   32 - UNBIND
   FE - UNBIND Type 'FE': Session Failure
      10086040 - IBM Sense Data


The IBM SNA Formats Guide defines this sense data as follows: 


   1008 - Invalid FM Header
   6040 - Invalid Attach Parameter: A parameter in the FMH-5
   Attach command conflicts with the statement of LU capability
   Previously provided in the BIND statement.

Additional query words:

Keywords : kbbug4.00 kbbug3.00.sp2 kbbug3.00.sp3
Version : WINDOWS:3.0SP2,3.0SP3,4.0
Platform : WINDOWS
Issue type : kbbug


Last Reviewed: July 8, 1999
© 2000 Microsoft Corporation. All rights reserved. Terms of Use.